Add state disk volume mounter

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

state/mapper/cryptdevice.go

@@ -0,0 +1,33 @@
+package mapper
+
+import cryptsetup "github.com/martinjungblut/go-cryptsetup"
+
+type cryptDevice interface {
+	// ActivateByPassphrase activates a device by using a passphrase from a specific keyslot.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_activate_by_passphrase
+	ActivateByPassphrase(deviceName string, keyslot int, passphrase string, flags int) error
+	// Deactivate deactivates a device.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_deactivate
+	Deactivate(deviceName string) error
+	// Format formats a Device, using a specific device type, and type-independent parameters.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_format
+	Format(deviceType cryptsetup.DeviceType, genericParams cryptsetup.GenericParams) error
+	// Free releases crypt device context and used memory.
+	// C equivalent: crypt_free
+	Free() bool
+	// Load loads crypt device parameters from the on-disk header.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_load
+	Load(cryptsetup.DeviceType) error
+	// KeyslotAddByVolumeKey adds a key slot using a volume key to perform the required security check.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_keyslot_add_by_volume_key
+	KeyslotAddByVolumeKey(keyslot int, volumeKey string, passphrase string) error
+	// KeyslotChangeByPassphrase changes a defined a key slot using a previously added passphrase to perform the required security check.
+	// Returns nil on success, or an error otherwise.
+	// C equivalent: crypt_keyslot_change_by_passphrase
+	KeyslotChangeByPassphrase(currentKeyslot int, newKeyslot int, currentPassphrase string, newPassphrase string) error
+}